Humerus is the upper arm bone.  Proximally, it articulates with the glenoid fossa of the scapula, forming the glenohumeral (shoulder) joint.  Distally, it articulates with the radius via the capitulum and with the ulna via the trochlea, forming the elbow joint.

Landmarks of the humerus are: head, anatomical neck, greater and lesser tubercles, intertubercular groove, surgical neck, deltoid tuberosity, medial and lateral epicondyle, olecranon fossa, radial fossa, coronoid fossa, trochlea and capitulum.